This is interesting indeed. Just last week, the episode of M:I with Victoria was on CHCH. I paid special attention whenever she was on screen, and not once could I see her as Isis.
The article says that she worked mostly as a contortionist. I wonder what plans the show-runners had for the character?
If it fits, she sits!
First “Two for the Money”.
Then Al Trania.
Now this.
The conundrums are falling like dominoes.
According to the CPI Inflation Calculator, the $84.51 she was paid in 1968 would be worth $613.85 today. Not too shabby for one day’s easy work! 
I thought it would be interesting to compare April’s pay for that one day with the show’s featured day players, like Nichelle Nichols and George Takei.
In Solow and Justman’s book, it says Nichelle was initially paid $700 per episode. According to CPI, $700 in 1966 (the first year of production) would be worth $5461.21 today.
An episode would normally take 6–7 days to film, and a featured day player could count on being in 6–7 episodes out of every 13 (possibly more). They would not be in every scene, of course, so some days of the filming week they might not work at all.
Again, not too shabby; however, they didn’t work year-round. The three seasons had only 29, 26, and 24 episodes, respectively.
It’s a little ironic that for someone (April Tatro) who apparently had some side career being a contortionist, her only job was to sit on a couch and look at the camera (and Teri Garr). I’m guessing that if the series had been picked up, she might have had an ongoing role as the Cat Lady, where her skills would have been more useful.
I suppose that if you were looking to make a series with an anthropomorphic cat as a recurring character, a contortionist would make sense for the role.
Yes. I’m sure she would’ve jumped through hoops to land that role.
Thanks for the update, **cochrane **(may we call you zefram?). Good to know. Memory Alpha has been updated: April Tatro | Memory Alpha | Fandom
As long as you realize that I’m Cochrane as played by James Cromwell in First Contact, and not Glenn Corbett from Metamorphosis. 
Just watched “Assignment: Earth” on H&I, and went to check if Isis was IDed. Found the trekmovie.com link.
Glad the mystery has been solved.
Brian
So. . . going back to the other point the OP raised in this thread. . .
Am I alone in thinking that the cat’s meow sounded just like Teri Garr?
Teri Garr was the cat’s meow.
So to speak.